<template>
<div>
  <!--  面包屑导航栏-->
  <el-breadcrumb separator-class="el-icon-arrow-right">
    <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
    <el-breadcrumb-item>商品管理</el-breadcrumb-item>
    <el-breadcrumb-item>参数列表</el-breadcrumb-item>
  </el-breadcrumb>

  <el-card>
<!--    警告区域-->
  <el-alert show-icon
    title="注意：只允许为第二级分类设置相关参数！"
    type="warning" :closable="false">
  </el-alert>

<!--    选择商品分类区域-->
    <el-row class="cat_opt">
      <el-col>
        <span>选择商品分类：</span>
<!--        选择商品分类的级联选择框-->
        <el-cascader
          expand-trigger="hover"
          :options="catelist"
          :props="cateProps"
          v-model="selectedCatekeys"
          @change="CateChanged" clearable change-on-select></el-cascader>
      </el-col>
    </el-row>

<!--    tab页签区域-->
    <el-tabs v-model="activeName" @tab-click="handleTabClick">
      <el-tab-pane label="动态参数" name="many">
        <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
     <el-table :data="manyTableData" border stripe>
       <el-table-column type="expand">
         <template slot-scope="scope">
              <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">
                  {{item}}
              </el-tag>

<!--           输入的文本框-->
           <el-input
             class="input-new-tag"
             v-if="scope.row.inputVisible"
             v-model="scope.row.inputValue"
             ref="saveTagInput"
             size="small"
             @keyup.enter.native="handleInputConfirm(scope.row)"
             @blur="handleInputConfirm(scope.row)"
           >
           </el-input>
<!--           添加按钮-->
           <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
         </template>
       </el-table-column>
       <el-table-column type="index"></el-table-column>
       <el-table-column label="参数名称" prop="attr_name"></el-table-column>
       <el-table-column label="操作">
         <template slot-scope="scope">
           <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
           <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParamsById(scope.row.attr_id)">删除</el-button>
         </template>
       </el-table-column>
     </el-table>
      </el-tab-pane>
      <el-tab-pane label="静态属性" name="only">
        <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
        <el-table :data="onlyTableData" border stripe>
          <el-table-column type="expand">
            <template slot-scope="scope">
              <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">
                {{item}}
              </el-tag>

              <!--           输入的文本框-->
              <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)">
              </el-input>
              <!--           添加按钮-->
              <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
            </template>
          </el-table-column>
          <el-table-column type="index"></el-table-column>
          <el-table-column label="属性名称" prop="attr_name"></el-table-column>
          <el-table-column label="操作">
            <template slot-scope="scope">
              <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
              <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParamsById(scope.row.attr_id)">删除</el-button>
            </template>
          </el-table-column>
        </el-table>
      </el-tab-pane>
    </el-tabs>
  </el-card>

  <el-dialog
    :title="'添加' + titleText "
    :visible.sync="addDialogVisible"
    width="50%" @close="addDialogClosed">
    <!--    内容主体区域-->
    <el-form :model="addForm" status-icon :rules="addFormRules" ref="addFormRef" label-width="70px" >
      <!--        prop 效验-->
      <el-form-item :label="titleText" prop="attr_name">
        <el-input v-model="addForm.attr_name"></el-input>
      </el-form-item>
    </el-form>

    <!--    底部区域-->
    <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams" >确 定</el-button>
  </span>
  </el-dialog>
  <el-dialog
    :title="'修改' + titleText "
    :visible.sync="editDialogVisible"
    width="50%" @close="editDialogClosed">
    <!--    内容主体区域-->
    <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" >
      <!--        prop 效验-->
      <el-form-item :label="titleText" prop="attr_name">
        <el-input v-model="editForm.attr_name"></el-input>
      </el-form-item>
    </el-form>

    <!--    底部区域-->
    <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams" >确 定</el-button>
  </span>
  </el-dialog>
</div>
</template>

<script>
export default {
  data () {
    return {
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定到的数组
      selectedCatekeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      manyTableData: [],
      onlyTableData: [],
      addDialogVisible: false,
      addForm: [],
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入正确的参数名称', trigger: 'blur' }
        ]
      },
      editDialogVisible: false,
      editForm: [],
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入正确的参数名称', trigger: 'blur' }
        ]
      }
      // // 控制按钮与文本框的切换显示
      // inputVisible: false,
      // // 文本框中输入的内容
      // inputValue: ''
    }
  },
  created () {
    // 获取所有的商品分类列表
    this.getCateList()
  },
  methods: {
    // 获取商品分类依据
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      console.log(res.data)
      // 把数据列表，赋值给catelist
      this.catelist = res.data
    },
    // 级联选择框选中项变化，会触发这个函数
    CateChanged () {
      this.getParamsData()
    },
    handleTabClick () {
      console.log(this.activeName)
      this.getParamsData()
    },
    // 获取参数的数据列表
    async getParamsData () {
      // console.log(this.selectedCatekeys)
      // 证明选中的不是三级分类
      if (this.selectedCatekeys.length !== 3) {
        this.selectedCatekeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      console.log(this.selectedCatekeys)
      // 根据所选分类的id，和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }
      // this.$message.success('获取参数列表成功！')

      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    addParams () {
      this.$refs.addFormRef.validate(async vaild => {
        // console.log(vaild)
        if (!vaild) return
        // 可以发起添加用户的网络请求
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, { attr_name: this.addForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    async showEditDialog (id) {
      console.log(id)
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${id}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }
      this.editForm = res.data
      console.log(this.editForm)
      this.editDialogVisible = true
    },
    editDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    async editParams () {
      this.$refs.editFormRef.validate(async vaild => {
        // console.log(vaild)
        if (!vaild) return
        // 可以发起添加用户的网络请求
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败！')
        }
        this.$message.success('修改参数成功！')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    async removeParamsById (id) {
      console.log(id)
      // 弹框询问用户是否删除数据
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => {
        return err
      })
      // 如果用户确定删除，则返回值为字符串 confirm
      // 如果用户取消删除，则返回值为字符串 cancel
      //  console.log(confirmResult)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      // console.log('确认删除')
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('参数删除失败！')
      }
      this.$message.success('参数删除成功！')
      this.getParamsData()
    },
    // 文本框失去焦点，或摁下了Enter都会触发
    async handleInputConfirm (row) {
      // 方法用于删除字符串的头尾空白符，空白符包括：空格、制表符 tab、换行符等其他空白符等。
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return，则证明输入的内容，需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发起请求，保存这次操作
      this.saveAttrVals(row)
    },
    // 点击按钮，展示文本框入框
    showInput (row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选项
    handleClose (i, row) {
      row.attr_vals.splice(i, 1)
      console.log(row)
      this.saveAttrVals(row)
    },
    // 将attr_vals的操作，保存到数据库
    async saveAttrVals (row) {
      // 需要发起请求，保存这次操作
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, { attr_name: row.attr_name, attr_sel: row.attr_sel, attr_vals: row.attr_vals.join(',') })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败！')
      }
      this.$message.success('修改参数项成功！')
    }
  },
  computed: {
    // 如果按钮被需要被禁用，则返回true，否则返回false
    isBtnDisabled () {
      if (this.selectedCatekeys.length !== 3) {
        return true
      }
      return false
    },
    cateId () {
      if (this.selectedCatekeys.length === 3) {
        return this.selectedCatekeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt{
  margin: 15px 0;
}
  .el-tag{
    margin: 5px;
  }
  .input-new-tag{
    width: 120px;
  }
</style>
